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Telegram/lib_base/base/enum_mask.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+namespace base {
+
+template <typename Enum>
+class enum_mask {
+	using Type = std::uint32_t;
+
+public:
+	static_assert(static_cast<int>(Enum::kCount) <= 32, "We have only 32 bit.");
+
+	enum_mask() = default;
+	enum_mask(Enum value) : _value(ToBit(value)) {
+	}
+
+	static enum_mask All() {
+		auto result = enum_mask();
+		result._value = ~Type(0);
+		return result;
+	}
+
+	enum_mask added(enum_mask other) const {
+		auto result = *this;
+		result.set(other);
+		return result;
+	}
+	void set(enum_mask other) {
+		_value |= other._value;
+	}
+	bool test(Enum value) const {
+		return _value & ToBit(value);
+	}
+
+	explicit operator bool() const {
+		return _value != 0;
+	}
+
+private:
+	inline static Type ToBit(Enum value) {
+		return 1 << static_cast<Type>(value);
+	}
+	Type _value = 0;
+
+};
+
+} // namespace base